Push-pull reproducer



1,642,124 P 1927' F. E. MILLER E A PUSH PULL REPRODUCER Original Filed March 24, I925 MINVENT0RB$ W 175 77/5 ATTORNEY.

Patented Sept. 13, 1927.

UNITED STATES PATENT. OFFICE.

FRANK E. MILLER AND ROBERT M. LACEY, OF NEW YORK, N.- Y.,'ASSIGNORS TO FRANK E. MILLER RADIO CORPORATION, OF NEW YORK, N. Y.

PUSH-PULL REPRODUCER.

App1ication filed March 24, 1925, Serial No. 17,869. Renewed June 29, 1927.

Qur invention relates to the reproduction of'sound, especially adapted for use 'asa loud speaker in radio reception.

It is an object of our invention to make 5 use of the push pull principle so that the t energy of the reproducingmagnet may be exerted in two directions simultaneously,

Our in ention will be better understood by reference to illustrative embodiments thereof, to which the accompanying claims are directed as examples merely, which are described in-the following specification and which are shown in the accompanying drawings forming a part thereof. In the drawings Figure 1 is an endelevation partly in section; Fig. 2 is a schematic diagram of the electrical and mechanical connections; Fig. 3 is a side. elevation of one portion of the diaphragm proper 4 shows a'plane view of a possible esign insquare section, and Fig. 5 is an end elevation of the design shown in Fig. 4.

Referring to Fig. 1, L is the connection wires from the electrical circuit, A is the base and B is the outer frame of our de vice, G and D are the respective diaphragms proper which we prefer to connect to each stylus H and G respectively at the eccentric pointsfll and 1, although these 50 "maybe connected at the apex of the coneshaped diaphragm G and D. E E are the magnetic core and coils and F is a point of fulcrum in the stylus arms. K is. a handle integral with the frame B. By reference to Fig. 2 it will be seen tha coils R and Q connected with theelectrical circuits 0 and, P are so connected that they will function with the permanent magnets so'as to give. a push pull action on the arm F revolvingahout the axis M so that if the arm F, acts in one direction the stylus connections H and G will tend to operate in opposite directions and proportionately cause the diaphragms C and D to vibrate. If an electrical current is passed through the coils causing magnetic lines of force to augment the permanent magnetization of the cores our connections. are such that the poles of,

Fig;

netized in polarity so that double action on the arm F is obtained, resulting in apush pull effect of the diaphragms G and D.

In Fig. 4' we show a square section adaptation of our device. Magnets similar to the 5 'magnet X are mounted on the frame U at V, NV and T, the connecting link Y being securely fastened to the separate sides of the frame by studs or rivets Z Z, and provision being made to connect the arm F atM as in the circular section.

Having thus described our invention,

what we claim and desire to secure by U S.

Letters Patentis: 4

1, A push pull reproducer comprising a base, a frame mounted in said base, cusp shaped diaphragms mounted at'their pe riphery in said frame, having stylus connections leverally operative through an electromagnet adapted to simultaneously 7 and in opposite directions operate said styli and diaphragms.

2. A push pull reproducer comprising a base, a frame mounted in said base, eccen-, trio cusp shaped diaphragms mounted at their periphery in said frame, having stylus connections leverally operative through an electromagnet adapted to simultaneously and 'n opposite directions operate said styli and diaphragm's.

3. A push pull reproducer comprising a base, a frame mounted in said base, cusp shaped diaphragms mounted at their periphery in said frame, having styl us con- 'nections leverally operative through an electromagnet having square section cores and adapted to simultaneously and in opposite directions operate said styli and diaphragms.

4. A push pull reproducer comprising a base, a frame mounted in said base, eccenv tric cusp shaped diaphragins mounted at theirperiphery in saidframe, having stylus connections leverally operative through an electromagnet having square section cores and adapted to simultaneously and in opposite directions operatesaid styli and diaphragms. I

5. The combination "1n a push pull repro- ,ripheries are joined in the frame of said ducer of an electromagnet having two secreproducer.

tions and a magnetlcally operative arm piv- In witness whereof we have hereunto otally placed between said sections free to signed 'our names the 3rd day of March, 5 swing in the magnetic: field created thereby 1925.

and leverally connected at each end with v stylus arms adapted to simultaneously actu- FRANK E. MILLER.

ate two cusp shaped diaphra-gms whose pe-' I I ROBERT LACEY. 

